diff options
Diffstat (limited to 'lib/dpkg/db-fsys-divert.c')
| -rw-r--r-- | lib/dpkg/db-fsys-divert.c | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/lib/dpkg/db-fsys-divert.c b/lib/dpkg/db-fsys-divert.c new file mode 100644 index 0000000..bf0b7ff --- /dev/null +++ b/lib/dpkg/db-fsys-divert.c @@ -0,0 +1,132 @@ +/* + * libdpkg - Debian packaging suite library routines + * db-fsys-divert.c - management of filesystem diverted files database + * + * Copyright © 1995 Ian Jackson <ijackson@chiark.greenend.org.uk> + * Copyright © 2000, 2001 Wichert Akkerman <wakkerma@debian.org> + * + * This is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <https://www.gnu.org/licenses/>. + */ + +#include <config.h> +#include <compat.h> + +#include <sys/types.h> +#include <sys/stat.h> + +#include <errno.h> +#include <string.h> +#include <pwd.h> +#include <grp.h> +#include <fcntl.h> +#include <unistd.h> +#include <stdlib.h> + +#include <dpkg/i18n.h> +#include <dpkg/dpkg.h> +#include <dpkg/dpkg-db.h> +#include <dpkg/debug.h> +#include <dpkg/db-fsys.h> + +static struct fsys_diversion *diversions = NULL; +static char *diversionsname; + +void +ensure_diversions(void) +{ + static struct stat sb_prev; + struct stat sb_next; + char linebuf[MAXDIVERTFILENAME]; + static FILE *file_prev; + FILE *file; + struct fsys_diversion *ov, *oicontest, *oialtname; + + if (diversionsname == NULL) + diversionsname = dpkg_db_get_path(DIVERSIONSFILE); + + onerr_abort++; + + file = fopen(diversionsname, "r"); + if (!file) { + if (errno != ENOENT) + ohshite(_("failed to open diversions file")); + } else { + setcloexec(fileno(file), diversionsname); + + if (fstat(fileno(file), &sb_next)) + ohshite(_("failed to fstat diversions file")); + + /* + * We need to keep the database file open so that the + * filesystem cannot reuse the inode number (f.ex. during + * multiple dpkg-divert invocations in a maintainer script), + * otherwise the following check might turn true, and we + * would skip reloading a modified database. + */ + if (file_prev && + sb_prev.st_dev == sb_next.st_dev && + sb_prev.st_ino == sb_next.st_ino) { + fclose(file); + onerr_abort--; + debug(dbg_general, "%s: same, skipping", __func__); + return; + } + sb_prev = sb_next; + } + if (file_prev) + fclose(file_prev); + file_prev = file; + + for (ov = diversions; ov; ov = ov->next) { + ov->useinstead->divert->camefrom->divert = NULL; + ov->useinstead->divert = NULL; + } + diversions = NULL; + if (!file) { + onerr_abort--; + debug(dbg_general, "%s: none, resetting", __func__); + return; + } + debug(dbg_general, "%s: new, (re)loading", __func__); + + while (fgets_checked(linebuf, sizeof(linebuf), file, diversionsname) >= 0) { + oicontest = nfmalloc(sizeof(*oicontest)); + oialtname = nfmalloc(sizeof(*oialtname)); + + oialtname->camefrom = fsys_hash_find_node(linebuf, 0); + oialtname->useinstead = NULL; + + fgets_must(linebuf, sizeof(linebuf), file, diversionsname); + oicontest->useinstead = fsys_hash_find_node(linebuf, 0); + oicontest->camefrom = NULL; + + fgets_must(linebuf, sizeof(linebuf), file, diversionsname); + oicontest->pkgset = strcmp(linebuf, ":") ? + pkg_hash_find_set(linebuf) : NULL; + oialtname->pkgset = oicontest->pkgset; + + if (oialtname->camefrom->divert || + oicontest->useinstead->divert) + ohshit(_("conflicting diversions involving '%.250s' or '%.250s'"), + oialtname->camefrom->name, oicontest->useinstead->name); + + oialtname->camefrom->divert = oicontest; + oicontest->useinstead->divert = oialtname; + + oicontest->next = diversions; + diversions = oicontest; + } + + onerr_abort--; +} |